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MV & LV SERIES ENGINEERED DRY CHEMICAL FIRE EXTINGUISHING SYSTEM
OPERATION, DESIGN, & SERVICE MANUAL
REV C
Document # DOC324
Issued: April 26, 2018
Revised: March 22, 2022
UL FILE # EX27541
Section 1 General Information
1 GENERAL INFORMATION
e Janus Fire Systems® Mv and Lv Series Engineered Dry Chemical Fire Extinguishing Systems utilize
ABC (multi-purpose) dry chemical agent to provide fire protection for:
• General Purpose and Industrial Hazards which can incorporate total flooding protection, local
application protection, the use of specialized nozzle designs (as detailed in this manual) or a combination
of the above protection methods
• Vehicle Paint Spray Booth Hazards
• Open Front Paint Spray Booth Hazards
Systems utilizing ABC dry chemical agent may be used for surface fires classified as Class A (wood, paper,
cloth, rubber, and many plastics), Class B (flammable/combustible liquids and gases), and Class C (energized
electrical equipment).
NFPA 17 mandates that dry chemical extinguishing systems shall not be considered satisfactory protection
for the following:
• Chemicals containing their own oxygen supply, such as cellulose nitrate
• Combustible metals such as sodium, potassium, magnesium, titanium, and zirconium
• Deep-seated or burrowing fires in ordinary combustibles where the dry chemical cannot reach the point
of combustion
NOTE: Before dry chemical extinguishing is considered for use in protection of electronic equipment or
delicate electrical relays, the effect of residual deposits of dry chemical on the performance of electronic
equipment shall be evaluated. ABC dry chemical shall not be used on machinery such as carding equipment
in textile operations.
Janus Fire Systems has separated the protection design guidelines for Mv and Lv Series Engineered Dry
Chemical Fire Extinguishing Systems into the following separate sections:
• General Purpose and Industrial Hazards (Section 3.2)
• Vehicle Paint Spray Booths Hazards (Section 3.3)
• Open Front Paint Spray Booth Hazards (Section 3.4)
e Janus Fire Systems® Mv and Lv Series Engineered Dry Chemical Fire Extinguishing System and
individual components are common to all three of the above referenced hazard protection guidelines and
are detailed in Section 2 of this manual.
Piping arrangements for the Janus Fire Systems® Mv and Lv Series Engineered Dry Chemical Fire
Extinguishing System are not required to be balanced as is required by NFPA 17 for pre-engineered type
dry chemical systems. In addition, parameter limitations involving pipe lengths, the number of elbows, and
other factors such as the allowable distances (equivalent/feet) from cylinder/valve assembly do not apply.
All dry chemical nozzles referenced in this manual can be designed and installed in unbalanced piping
arrangements.
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